[PATCH v2 2/3] configure: Add systemd detection to --with-init-script=check

[Andrea Bolognani <abologna@xxxxxxxxxx>]

Most distributions, including RHEL, have switched to systemd,
so we should detect it and act accordingly. This also means
that 'systemd+redhat' should be preferred to legacy 'redhat'.

Our witness for the check is the availability of the systemctl
command on the host.
---
 configure.ac | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/configure.ac b/configure.ac
index 4149e20..f5cb1c3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -634,7 +634,15 @@ if test "$with_init_script" = check; then
     if test "$cross_compiling" = yes; then
         with_init_script=none
     fi
+    if type systemctl >/dev/null 2>&1; then
+        if test "$with_init_script" = check; then
+            with_init_script=systemd
+        fi
+    fi
     if test -f /etc/redhat-release; then
+        if test "$with_init_script" = systemd; then
+            with_init_script=systemd+redhat
+        fi
         if test "$with_init_script" = check; then
             with_init_script=redhat
         fi
-- 
2.5.5

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